Speaker
Prof.
Reinhard Schlickeiser
(Ruhr-University Bochum, Germany)
Description
Understanding cosmic $(\delta B,\delta E)$-fluctuations in magnetized (interstellar medium) and nonmagnetized (IGM: intergalactic medium) plasmas is of crucial importance for cosmic ray transport, including the role of collective and noncollective modes and wave-like, weakly-propagating and aperiodic fluctuations. The ordering $B_0\gg \delta B\gg \delta E$ in magnetized systems, necessary for explaining the observed nearly isotropic CR momentum distribution function, is the basis for a perturbation scheme leading to the modified diffusion-convection CR transport equation and expressions for the CR anisotropy.
The nonmagnetized IGM medium containes aperiodic magnetic fluctuations which are spontaneously emitted by the fully-ionized thermal electron-proton IGM plasma at a level of $\vert \delta B\vert =1.5\cdot 10^{-16}n_{-7}T_4^{-3/2}$ G. These spontaneously emitted fluctuations affect the propagation of CR protons and electrons in the IGM at energies below $10^{15}$ eV.
Primary author
Prof.
Reinhard Schlickeiser
(Ruhr-University Bochum, Germany)
